Longman Dictionary of Contemporary English
Douglas Harper's Etymology Dictionary
Wiktionary
n. 1 Something which can be appended to something else. 2 (context computer hardware software English) A software extension or hardware peripheral that provides additional functions or customization for a core application or system.
WordNet
n. a component that is added to something to improve it; "the addition of a bathroom was a major improvement"; "the addition of cinammon improved the flavor" [syn: addition, improver]
a supplementary component that improves capability [syn: accessory, appurtenance, supplement]
Wikipedia
Add-on may refer to:
Mozilla add-ons are installable enhancements to the Mozilla Foundation's projects, including Firefox, Thunderbird, SeaMonkey, and Sunbird. Add-ons allow the user to add or augment application features, use themes to their liking, and handle new types of content.
There are three major categories of add-ons: "Extensions", "Themes", and "Plug-ins". The main repository for distributing the first two type is the eponymous Mozilla Add-ons website.
Usage examples of "add-on".
Annex to engineer an add-on Jammer module for the Mark I, and eight more weeks for LifeShield Arsenal to convert Plants 4, 5 and 9 to Jammer production.
Two add-on paragraphs quoted from a CIA report from Washington: Such capsules were first developed in 1951 by Czechoslovakian chemists and supplied to Communist agents in the Near East areas for several years.
They had enough tech implants, add-ons, and cutting-edge options to technically qualify as cyborgs, and their personal habits occasionally bordered on disgusting.
The cantilevered gun, massive against any other backdrop, stuck out of the turret like a giant telescope and was so small in comparison it looked like an accidental add-on.
They wear simple clothes and three fashions of camouflage, plus a stew of mental add-ons and microchine helpers as well as an array of sensors that never blink, watching what human eyes cannot see.
He needs his practice, and more important, he needs confidence, learning to trust his add-ons and his careful preparations, and his breeding, and his own good luck.
Her add-ons and sensors have built this very simple geometry to represent something far more elaborate.
The prison-ball has been reengineered, slathered with camouflage and armor and the best immune-suppressors on the market, and its navigation system has been adapted from add-ons stolen from the finest trashcans.
But programmers weren't programmers anymore, and agents for transportation systems, mass communications, and the rest could not be so generically adapted—and the filters and add-ons had to be pretty basic and generic to cover a wide and diverse population and geography.
Or consider the automobile dealership: the salesman does his best to obscure the car's base price under a mountain of add-ons and incentives.
Somewhere underneath the dark, Purple-built squatter’s boxes and pseudo-art and dayclubs was the straight-out, linear, geometric corridors and passages laid out by the original architect of the hab. Prob if they cleared away all the Purpbuilt add-ons it would take half as long to get anywhere, and there would be more room in the place to boot.